SAP HCI is created as Integration System-as-a-Services (PAAS) which helps you to combine various independent techniques/apps for a company process. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI provides Adapters (Connectivity possibilities) for instance: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-onboarding47913.luwebs.com/28809179/hana-cloud-integration